Improvement in dies for making wrench-heads



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Improvement in Dies for making Wrench Heads. No.123,554. Patented Feb. 13,1872.

UNITE STAE LUKE CHAPMAN, OF COLLINSVILLE, CONNECTICUT, ASSIGNOR TO THE COLLINS COMPANY, OF SAME PLACE.

IMPROVEMENT IN DIES FOR MAKING WRENCH-HEADS.

Specification forming'part of Letters Patent No. 123,554, dated February 13, 1872.

SPECIFICATION.

I, LUKE CHAPMAN, of Collinsville, in the county of Hartford and Stateof Connecticut, have invented an Improvement in the Mannfacture of WrenchHeads, of which the following is a specification, reference being had to the accompanying drawing, in which- Figure 1 is a View of aforging, known hereinafter as a wrench-forging, having a head upon the end of about the dimensions relative to the body of the bar, as shown, which wrench-forging is to be afterwards subjected to the action of the dies hereinafter described. Fig. 2 is a view of the lower die. Fig. 3 is a view of the upper die, it being turned face upward in an exactly reversed position from that it has when in use, for the purpose of 6X posing the face to view. Fig. 4is-a central vertical longitudinal section of the heated bar and the lower die through the dotted line as a: in Figs. 1 and 3, the bar being inserted in the die. .Fig. 5 is a central vertical longitudinal section through the same plane as in Fig. 4 of the bar and bothd-ies after the dies have acted upon the bar and formed the wrenchhead.

One object of this improvement is to produce a wrench-head by a process very much abridged from that in common use, as heretofore, in which common process the tools commonly known as heading tools are used, involving the expenditure of a great deal of skilled labor.

Another object is to produce a wrench in whichthe fibers of the metal shall be continuous from the bar into the body of the head, which is not the case in wrenches made by the old process.

The process is as follows: A wrench-forgin g substantially like that shown in Fig. 1, and having a headed end, a, of about the same dimensions relative to the bar A, as shown, is first produced.

I produce this, preferably, by taking a bar of the size'of the headed end a and thenheat ing it and drawing its body down under a hammer, or by other similar manipulation, to the size of the bar A. This might be done by dies, rolls, or other equivalent machinery; but I prefer the process indicated.

Having produced the wrench-forging as shown in Fig. 1, leaving metal enough in the large end to form the intended wrench-head, and leaving the bar A of about the right size for the intended wrench-bar, this wrench-forging is reheated and placed in the lower die B, as shown in Fig. 4, this lower die being secured in the stationary seat of a drop. The up per die C, shown in Fig. 2, being fastened properly to the drop-weight is then allowed to descend upon it from the proper height, generally about three feet, which upsets the top of the headed bar into the form of a wrench-head, d, as shown in Fig. 5. \Vhen the drop-weight moves upward again, carrying tliedie C with it, the forward wrench-head will stick in the die C and rise with it, from whence the operator immediately takes it with a pair of tongs and lays the formed head sidewise on the cutaway end I) of the die 13, and allows the die C to again descend upon it in this position, which completely flattens the two sides of the head just formed, and removes any web or other similar imperfection that may have formed upon these sides. The forging is immediately again placed in the die B and restruck by the die C, and is now finished so far as the forging process is concerned.

The cut-away I) is of just the right depth tov give thewrench-head the proper thickness from side to side.

In the swagin g process the lower die B forms the hammer end of the wrench-head, and also the under surface thereof; the toe end, the

two sides, the top, and the bevel of the head are all formed by the upper die 0..

i Claims. 

